Economic and Environmental Geology

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Table. 6.

Table. 6.

Summary on ultrasonic velocity of foundation stones in the Sebyeonggwan Hall

Classification Direct Ultrasonic Velocity (㎧) Weathering
Coefficient (K)
Weathering Grade
Max Min Mean
Dacitic Lapilli Tuff 3,880 2,838 3,385 0.32 MW
Basaltic Welded Tuff 3,786 3,731 3,758 0.25 MW
Andesitic Welded Tuff 4,008 3,233 3,767 0.25 MW
Basaltic Andesite 4,362 3,141 3,990 0.20 MW
Rhyolite - - 4,112 0.18 SW
Diorite 4,480 3,914 4,248 0.15 SW

MW; moderately weathered, SW; slightly weathered

Econ. Environ. Geol. 2021;54:199-212 https://doi.org/10.9719/EEG.2021.54.2.199
© 2021 Econ. Environ. Geol.